diff --git a/nixos/modules/services/audio/mopidy.nix b/nixos/modules/services/audio/mopidy.nix
index a534b692f17..d30c227db42 100644
--- a/nixos/modules/services/audio/mopidy.nix
+++ b/nixos/modules/services/audio/mopidy.nix
@@ -13,11 +13,11 @@ let
   mopidyEnv = buildEnv {
     name = "mopidy-with-extensions-${mopidy.version}";
     paths = closePropagation cfg.extensionPackages;
-    pathsToLink = [ "/${python.sitePackages}" ];
+    pathsToLink = [ "/${python3.sitePackages}" ];
     buildInputs = [ makeWrapper ];
     postBuild = ''
       makeWrapper ${mopidy}/bin/mopidy $out/bin/mopidy \
-        --prefix PYTHONPATH : $out/${python.sitePackages}
+        --prefix PYTHONPATH : $out/${python3.sitePackages}
     '';
   };
 in {
diff --git a/pkgs/applications/audio/mopidy/default.nix b/pkgs/applications/audio/mopidy/default.nix
index 2df54fa7fb4..c1c8bb964e4 100644
--- a/pkgs/applications/audio/mopidy/default.nix
+++ b/pkgs/applications/audio/mopidy/default.nix
@@ -1,16 +1,16 @@
-{ stdenv, fetchFromGitHub, pythonPackages, wrapGAppsHook
+{ stdenv, fetchFromGitHub, python3Packages, wrapGAppsHook
 , gst_all_1, glib-networking, gobject-introspection
 }:
 
-pythonPackages.buildPythonApplication rec {
+python3Packages.buildPythonApplication rec {
   pname = "mopidy";
-  version = "2.3.1";
+  version = "3.0.1";
 
   src = fetchFromGitHub {
     owner = "mopidy";
     repo = "mopidy";
     rev = "v${version}";
-    sha256 = "1qdflxr0an6l2m3j90h55bzyj7rjlkkwmxx945hwv8xi472rcgdj";
+    sha256 = "0fpjprjw143ixak68iwxjpscdjgyb7rsr1cxj7fsdrw6hc83nq4z";
   };
 
   nativeBuildInputs = [ wrapGAppsHook ];
@@ -20,7 +20,7 @@ pythonPackages.buildPythonApplication rec {
     glib-networking gobject-introspection
   ];
 
-  propagatedBuildInputs = with pythonPackages; [
+  propagatedBuildInputs = with python3Packages; [
     gst-python pygobject3 pykka tornado_4 requests setuptools
   ] ++ stdenv.lib.optional (!stdenv.isDarwin) dbus-python;
 
diff --git a/pkgs/applications/audio/mopidy/iris.nix b/pkgs/applications/audio/mopidy/iris.nix
index 88cdde2ceb2..6d9147a7f5d 100644
--- a/pkgs/applications/audio/mopidy/iris.nix
+++ b/pkgs/applications/audio/mopidy/iris.nix
@@ -1,18 +1,17 @@
-{ stdenv, pythonPackages, mopidy, mopidy-local-images }:
+{ stdenv, python3Packages, mopidy, mopidy-local-images }:
 
-pythonPackages.buildPythonApplication rec {
+python3Packages.buildPythonApplication rec {
   pname = "Mopidy-Iris";
-  version = "3.43.0";
+  version = "3.44.0";
 
-  src = pythonPackages.fetchPypi {
+  src = python3Packages.fetchPypi {
     inherit pname version;
-    sha256 = "1qg9xyjf27dp0810h4kdliyfb8r3kvi37lq8r93d01xwfphdzs05";
+    sha256 = "0gap0cyw6sfb4487i1x220rr9fbsz6xyw68l15ar0vfll0zv0760";
   };
 
   propagatedBuildInputs = [
     mopidy
-    mopidy-local-images
-  ] ++ (with pythonPackages; [
+  ] ++ (with python3Packages; [
     configobj
     requests
     tornado_4
diff --git a/pkgs/applications/audio/mopidy/spotify.nix b/pkgs/applications/audio/mopidy/spotify.nix
index 483852455aa..a01bf6c80d3 100644
--- a/pkgs/applications/audio/mopidy/spotify.nix
+++ b/pkgs/applications/audio/mopidy/spotify.nix
@@ -1,15 +1,15 @@
-{ stdenv, fetchurl, pythonPackages, mopidy }:
+{ stdenv, fetchurl, python3Packages, mopidy }:
 
-pythonPackages.buildPythonApplication rec {
+python3Packages.buildPythonApplication rec {
   pname = "mopidy-spotify";
-  version = "3.1.0";
+  version = "4.0.1";
 
   src = fetchurl {
     url = "https://github.com/mopidy/mopidy-spotify/archive/v${version}.tar.gz";
-    sha256 = "1mh87w4j0ypvsrnax7kkjgfxfpnw3l290jvfzg56b8qlwf20khjl";
+    sha256 = "1ac8r8050i5r3ag1hlblbcyskqjqz7wgamndbzsmw52qi6hxk44f";
   };
 
-  propagatedBuildInputs = [ mopidy pythonPackages.pyspotify ];
+  propagatedBuildInputs = [ mopidy python3Packages.pyspotify ];
 
   doCheck = false;
 
diff --git a/pkgs/development/python-modules/pykka/default.nix b/pkgs/development/python-modules/pykka/default.nix
index c07f1b46cbe..8482b1e1bc8 100644
--- a/pkgs/development/python-modules/pykka/default.nix
+++ b/pkgs/development/python-modules/pykka/default.nix
@@ -5,12 +5,12 @@
 
 buildPythonPackage rec {
   pname = "pykka";
-  version = "1.2.0";
+  version = "2.0.1";
 
   src = fetchgit {
     url = "https://github.com/jodal/pykka.git";
     rev = "refs/tags/v${version}";
-    sha256 = "0qlfw1054ap0cha1m6dbnq51kjxqxaf338g7jwnwy33b3gr8x0hg";
+    sha256 = "011rvv3vzj9rpwaq6vfpz9hfwm6gx1jmad4iri6z12g8nnlpydhs";
   };
 
   # There are no tests